Note

This product contains 4 disputed ingredients: Chromium (as Chromium nicotinate glycine chelate), Rhodiola extract (Rhodiola rosea)(root)(5% rosavins), Cordyceps (from Cs-4 Paecilomyces hepiali and Cordyceps militaris extracts) (mycelia biomass), ATProTM Matrix (Calcium Pyruvate, Sodium Phosphate, Potassium Phosphate, Ribose). Evidence is mixed or doses are undisclosed — see the ingredient science section below for details.

First Endurance
First Endurance

Optygen

★★★★★
4.6 / 5·19 reviews at The FeedPerformance

Rating and review count from The Feed's customers. Pello community reviews are submitted separately on Pello.

$59.95for 30 servings· $2.00 per serving
Where to buy

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Used for: endurance athletes
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First Endurance
First EndurancePremiumFounded 2002

Founded in 2002.

View all 9 First Endurance products →
Strengths
  • Insufficient data
Watch out for
  • →4 disputed ingredients — check label
19
Reviews at The Feed
0
Quality standards
4
Key ingredients
Pello Score™

Below average

Notable weaknesses in one or more pillars

44
Science5/25
Transparency14/25
Value10/20
Athlete experience13/20
Quality2/10

Independent analysis No brand partnerships

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Ingredient science

Cross-referenced with PubMed & Examine.com

✓No flagged ingredients detected
Chromium (as Chromium nicotinate glycine chelate)200mcg
Disputed

A trace mineral marketed for blood sugar control and body composition; trials show small or no effects in healthy people.

Rhodiola extract (Rhodiola rosea)(root)(5% rosavins)300mg
Disputed

An adaptogenic herb studied for fatigue and stress; results for exercise and mental performance are mixed.

Cordyceps (from Cs-4 Paecilomyces hepiali and Cordyceps militaris extracts) (mycelia biomass)1000mg
Disputed

A mushroom marketed for energy and endurance; human evidence is limited and mixed.

ATProTM Matrix (Calcium Pyruvate, Sodium Phosphate, Potassium Phosphate, Ribose)800mg
Disputed

A sugar involved in making ATP; studies haven't shown consistent performance benefits in healthy athletes.

Quality standards

What these mean →

0 of 5 standards Pello tracks · No third-party banned-substance testing listed

Tested for sport

  • NSF Certified for Sport
  • Informed Sport
  • Cologne List

Food & sourcing

  • USDA Organic
  • Non-GMO Project Verified

Diet claims

  • Vegan: no

    Brand or retailer label claim, not a certification.

  • Gluten-free: yes

    Brand or retailer label claim. In the US a gluten-free label means under 20 ppm gluten.

  • Dairy-free: yes

    From the allergen list, where one is available.

Certifications are as listed on the product's page at The Feed. NSF Certified for Sport is also checked against NSF's own database. Certifications can lapse, so check the certifier's search before you rely on one, especially if you're drug tested.

Transparency & Sources

70
Good transparency
0 certifications · 19 reviews at The Feed
The Feed
19 reviewsmedium

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